Relevant bibliographies by topics / Potentiometric titration

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Academic literature on the topic 'Potentiometric titration'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Potentiometric titration"

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Gibson, Graham, Alexei A. Neverov, and R. S. Brown. "Potentiometric titration of metal ions in methanol." Canadian Journal of Chemistry 81, no. 6 (June 1, 2003): 495–504. http://dx.doi.org/10.1139/v03-035.

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The potentiometric titrations of nine lanthanideIII triflates, ZnII and CuII triflate, and the NiII, CoII, MgII, and TiIV perchlorates were obtained in methanol to determine the titration constants (defined as the sspH at which the [OCH3–]/[Mx+]t ratios are 0.5 and 1.5) as well as the apparent sspKa values for deprotonation of the metal-bound solvent molecules. The titrations were performed under various conditions with and without added salts as electrolytes, and the variations in the titration constants are discussed. In selected cases (La3+, Zn2+) the titration profiles were analyzed using a complex fitting program to obtain information about the species present in solution.Key words: potentiometric titration, methanol, sspH, metal ion, lanthanides, apparent sspKa.
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Денисов, О. С., and Е. Н. Корчуганова. "ПОТЕНЦИОМЕТРИЧЕСКОЕ ТИТРОВАНИЕ СОЛЕЙ ЦИНКА." Труды БГТУ Серия 2, № 1, no. 1 (241) 2021 (February 12, 2021): 24–29. http://dx.doi.org/10.52065/2520-2669-2021-241-1-24-29.

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Zhang, Lina, Toshiyuki Takematsu, and Takashi Norisuye. "Potentiometric titration of xanthan." Macromolecules 20, no. 11 (November 1987): 2882–87. http://dx.doi.org/10.1021/ma00177a041.

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Price, Randi, and Ping Wan. "Determination of Quaternary Ammonium Compounds by Potentiometric Titration with an Ionic Surfactant Electrode: Single-Laboratory Validation." Journal of AOAC INTERNATIONAL 93, no. 5 (September 1, 2010): 1542–52. http://dx.doi.org/10.1093/jaoac/93.5.1542.

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Abstract A potentiometric titration for determining the quaternary ammonium compounds (QAC) commonly found in antimicrobial products was validated by a single laboratory. Traditionally, QACs were determined by using a biphasic (chloroform and water) manual titration procedure. Because of safety considerations regarding chloroform, as well as the subjectivity of color indicator-based manual titration determinations, an automatic potentiometric titration procedure was tested with quaternary nitrogen product formulations. By using the Metrohm Titrando system coupled with an ionic surfactant electrode and an Ag/AgCl reference electrode, titrations were performed with various QAC-containing formulation products/matrixes; a standard sodium lauryl sulfate solution was used as the titrant. Results for the products tested are sufficiently reproducible and accurate for the purpose of regulatory product enforcement. The robustness of the method was measured by varying pH levels, as well as by comparing buffered versus unbuffered titration systems. A quantitation range of 11000 ppm quaternary nitrogen was established. Eight commercially available antimicrobial products covering a variety of matrixes were assayed; the results obtained were comparable to those obtained by the manual titration method. Recoveries of 94 to 104% were obtained for spiked samples.
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Gündüz, Turgut, Esma Kiliç, Güleren Özkan, Muhammed F. Awaad, and Mustafa Tastekin. "Conductimetric and potentiometric investigation of effect of acidity on formation of homoconjugates in acetonitrile solvent." Canadian Journal of Chemistry 68, no. 5 (May 1, 1990): 674–78. http://dx.doi.org/10.1139/v90-103.

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In the present work, 11 aromatic and nine aliphatic carboxylic acids, namely benzoic, 2-nitrobenzoic, 3-nitrobenzoic, 4-nitrobenzoic, 2,4-dinitrobenzoic, 3,5-dinitrobenzoic, 2-aminobenzoic, 3-aminobenzoic, 4-aminobenzoic, o-phthalic, salicylic, formic, acetic, monochloroacetic, dichloroacetic, trichloroacetic, propionic, n-butyric, caprylic, and myristic acids, were titrated conductimetrically and potentiometrically with triethylamine in acetonitrile solvent, under a nitrogen atmosphere, at 25 °C. Closer investigation of the conductimetric titration curves of these acids showed that the acidity of an acid, rather than the basicity of its conjugate base, plays a major part in the formation of homoconjugate ions, at least in acetonitrile solvent. If the acid is strong enough, there is a maximum before the experimental end point at about the half-neutralization point. To determine the minimum strength for an acid to show this maximum before the end point, all acids were also titrated potentiometrically. It was found that those acids which have half-neutralization potentials over −85 mV give a strong homoconjugation reaction and show a maximum before the experimental end point. Moreover, the acids that show maxima before the experimental end point in the conductimetric titration also show rather well-shaped potentiometric titration curves. Keywords: nonaqueous media, conductimetric titrations, potentiometric titrations, titration in acetonitrile, acidity and homoconjugation.
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Al-Ghannam, Sheikha M., Abdalla M. S. Abulkibash, and Abeer M. Al-Olyyan. "Differential Electrolytic Potentiometric Determination of Some Amino Acids in Dosage Forms." Journal of AOAC INTERNATIONAL 87, no. 3 (May 1, 2004): 671–76. http://dx.doi.org/10.1093/jaoac/87.3.671.

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Abstract The application of direct-current differential electrolytic potentiometry to the nonaqueous titration of amino acids was investigated. The basic character of amino acids in acetic acid was enhanced to permit their direct titration with perchloric acid. A pair of antimony electrodes was used as an indicating system. The shapes of the titration curves obtained were almost symmetrical with sharp peaks. The optimum current density for those titrations was found to be 1–2 μA/cm2. The procedure was applied successfully to the determination of certain amino acids in drug formulations, and the results were favorably compared statistically with those obtained by official methods.
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Khil’ko, S. L., A. I. Kovtun, and V. I. Rybachenko. "Potentiometric titration of humic acids." Solid Fuel Chemistry 45, no. 5 (October 2011): 337–48. http://dx.doi.org/10.3103/s0361521911050028.

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Soldatov, V. S. "Potentiometric titration of ion exchangers." Reactive and Functional Polymers 38, no. 2-3 (November 1998): 73–112. http://dx.doi.org/10.1016/s1381-5148(98)00018-2.

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Shul’ga, N. V., L. A. Gomolko, and N. P. Krut’ko. "Potentiometric titration of lignosulfonic acids." Russian Journal of Applied Chemistry 81, no. 7 (July 2008): 1278–82. http://dx.doi.org/10.1134/s107042720807029x.

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Pezzatini, G., G. Loglio, and S. Becagli. "Potentiometric titration of diprotic systems." Fresenius' Journal of Analytical Chemistry 358, no. 4 (June 17, 1997): 465–70. http://dx.doi.org/10.1007/s002160050447.

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Dissertations / Theses on the topic "Potentiometric titration"

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Gonçalves, Gabriela Soldi. "Atributos da validação do método analítico para quantificação da biotina empregando a técnica potenciométrica /." Araraquara : [s.n.], 2010. http://hdl.handle.net/11449/86497.

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Orientador: José Paschoal Batistuti
Banca: Fernando Luis Fertonani
Banca: Valeria Monterio da Silva Eleutério
Resumo: O presente trabalho consiste no desenvolvimento de um método analítico para determinação de biotina, utilizando-se a potenciometria indireta. O objetivo é apresentar a validação de método analítico como um processo que estime a eficiência do método proposto na rotina do laboratório para garantia da qualidade total. É um método que envolve equipamento simples e pouco dispendioso como o potenciômetro, que possibilita medir com precisão o valor da concentração de biotina. O doseamento quantitativo de biotina baseia-se no estudo das reações oscilantes do analito perante as análises da titulação indireta utilizando potenciômetro automático. A concentração de biotina foi determinada com massa adicionada conhecida numa matriz que simula uma cápsula, contendo aerosil (1%), estearato de magnésio (1%), celulose microcristalina (20%), amido (40%) e lactose q.s.p. Os resultados mostraram um valor médio de biotina (massa adicionada de aproximadamente 25 mg) determinada de 99,4% com desvio-padrão de 0,0345. As condições experimentais como temperatura, vidraria e concentração dos reagentes foram otimizadas. Os parâmetros investigados no processo de validação para demonstrar o desempenho do método foram: especificidade, linearidade, intervalo, precisão tanto repetitividade, quanto intermediária, exatidão e robustez. O tratamento estatístico dos dados da validação do método analítico envolveu a determinação da média, do desvio padrão e do coeficiente de variação. Para obtenção da curva de calibração se fez necessária a determinação da equação da reta, regressão linear e coeficiente de correlação linear. Este método apresenta grande aplicabilidade em soluções turvas, fluorescentes, opacas ou coradas, ou quando não existem, ou não podem aplicar-se indicadores visuais apropriados. Há possibilidade de determinação... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The present work shows the development of an analytical method for the determination of biotin by using indirect potentiometry. The main goal is to present the validation of analytical methods as a process to estimate the efficiency of the proposed methodology in the laboratory routine for the guaranty of total quality. This method involves simple and low cost devices as the potentiometer, which allows the precise measurement of biotin concentration. The quantitative dosing of biotin is based on the study of the oscillating chemical reactions with the analyte by performing the analysis of the indirect titration with an automatic potentiometer. Biotin concentration was determined by adding a known mass to a matrix that simulates a capsule containing aerosol (1%), estearato de magnésio (1%), celulose microcristalina (20%), amido (40%) e lactose q.s.p. The results showed an average value for the determination of biotin (added mass was ca. 25 mg) of 99.4% with a standard deviation of 0.0345. The experimental conditions as temperature, glassware, and concentration of the chemicals were optimized. The investigated parameters of the validation procedure to demonstrate the performance of the method were: specificity, linearity, interval, precision (repeatability and intermediate), exactness and robustness. The statistical treatment of the data for the validation of the analytical method involved the determination of the average value, standard deviation, and the variation coefficient. In order to obtain the calibration curve, the line's equation, the linear regression and the coefficient of linear correlation were determined. This method shows great applicability for turbid, fluorescent, opaque or color solutions, or if an appropriate visual indicator is not available or cannot be applied. The method also shows the possibility for the determination of a sequence of equivalence... (Complete abstract click electronic access below)
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Gonçalves, Gabriela Soldi [UNESP]. "Atributos da validação do método analítico para quantificação da biotina empregando a técnica potenciométrica." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/86497.

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Made available in DSpace on 2014-06-11T19:22:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-12-20Bitstream added on 2014-06-13T20:28:32Z : No. of bitstreams: 1 goncalves_gs_me_arafcf.pdf: 376750 bytes, checksum: d261fb301fa1b4c966236fbf2eb5c9d0 (MD5)
Universidade Estadual Paulista (UNESP)
O presente trabalho consiste no desenvolvimento de um método analítico para determinação de biotina, utilizando-se a potenciometria indireta. O objetivo é apresentar a validação de método analítico como um processo que estime a eficiência do método proposto na rotina do laboratório para garantia da qualidade total. É um método que envolve equipamento simples e pouco dispendioso como o potenciômetro, que possibilita medir com precisão o valor da concentração de biotina. O doseamento quantitativo de biotina baseia-se no estudo das reações oscilantes do analito perante as análises da titulação indireta utilizando potenciômetro automático. A concentração de biotina foi determinada com massa adicionada conhecida numa matriz que simula uma cápsula, contendo aerosil (1%), estearato de magnésio (1%), celulose microcristalina (20%), amido (40%) e lactose q.s.p. Os resultados mostraram um valor médio de biotina (massa adicionada de aproximadamente 25 mg) determinada de 99,4% com desvio-padrão de 0,0345. As condições experimentais como temperatura, vidraria e concentração dos reagentes foram otimizadas. Os parâmetros investigados no processo de validação para demonstrar o desempenho do método foram: especificidade, linearidade, intervalo, precisão tanto repetitividade, quanto intermediária, exatidão e robustez. O tratamento estatístico dos dados da validação do método analítico envolveu a determinação da média, do desvio padrão e do coeficiente de variação. Para obtenção da curva de calibração se fez necessária a determinação da equação da reta, regressão linear e coeficiente de correlação linear. Este método apresenta grande aplicabilidade em soluções turvas, fluorescentes, opacas ou coradas, ou quando não existem, ou não podem aplicar-se indicadores visuais apropriados. Há possibilidade de determinação...
The present work shows the development of an analytical method for the determination of biotin by using indirect potentiometry. The main goal is to present the validation of analytical methods as a process to estimate the efficiency of the proposed methodology in the laboratory routine for the guaranty of total quality. This method involves simple and low cost devices as the potentiometer, which allows the precise measurement of biotin concentration. The quantitative dosing of biotin is based on the study of the oscillating chemical reactions with the analyte by performing the analysis of the indirect titration with an automatic potentiometer. Biotin concentration was determined by adding a known mass to a matrix that simulates a capsule containing aerosol (1%), estearato de magnésio (1%), celulose microcristalina (20%), amido (40%) e lactose q.s.p. The results showed an average value for the determination of biotin (added mass was ca. 25 mg) of 99.4% with a standard deviation of 0.0345. The experimental conditions as temperature, glassware, and concentration of the chemicals were optimized. The investigated parameters of the validation procedure to demonstrate the performance of the method were: specificity, linearity, interval, precision (repeatability and intermediate), exactness and robustness. The statistical treatment of the data for the validation of the analytical method involved the determination of the average value, standard deviation, and the variation coefficient. In order to obtain the calibration curve, the line´s equation, the linear regression and the coefficient of linear correlation were determined. This method shows great applicability for turbid, fluorescent, opaque or color solutions, or if an appropriate visual indicator is not available or cannot be applied. The method also shows the possibility for the determination of a sequence of equivalence... (Complete abstract click electronic access below)
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Elmroth, Edvin. "Method development for quality control of the primary explosive, Potassium 4,6-Dinitrobenzofuroxan (KDNBF)." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-84289.

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“Green” explosives are an important sub-family of explosives due to the banning of explosives based on heavy metals, such as lead azide and lead styphnate, according to the REACH list. A substitute to lead azide is potassium 4,6-dinitrobenzofuroxane (KDNBF) which is an alternative “green” explosive. Hence there is an upcoming need for analytical and quality control protocols for KDNBF. In this report is HPLC-UV/VIS, GC-FID and potentiometric titration evaluated for their suitability as methods for testing of KDNBF. The results implies that KDNBF can be analyzed by GC-FID, when dissolved in DMSO and caffeine is used as internal standard. To analyze KDNBF by HPLC-UV/VIS was isocratic mode used together with a porous graphitic carbon (PGC) (Hypercarb ®) column. However, degradation of the analyte was severe and quantitative results were not obtained. Potentiometric titration indicated that KDNBF equilibrate with four hydrogen ions during titration, instead of the one to one ratio with potassium and hydrogen ion, as in previously proposed theory. Despite this and with careful titration is potentiometric titration and GC-FID analysis combined suitable as a quality control protocol for KDNBF.
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Braz, Ana KÃtia de Sousa. "CaracterizaÃÃo de Ãguas produzidas provenientes de plataformas marÃtimas da bacia do CearÃ." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13721.

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Nesse trabalho, foram caracterizadas 238 amostras de Ãgua produzida, oriundos de quatro campos de produÃÃo diferentes, todos provenientes de campos marÃtimos da bacia do CearÃ, denominados campo de produÃÃo A, campo de produÃÃo B, campo de produÃÃo C e campo de produÃÃo D. Foram determinados, os Ãnions (Acetato, Cloreto, Formiato, Sulfato) utilizando-se a cromatografia de Ãons; exceto, para o Ãnion Bicarbonato que foi determinado utilizando-se a titulaÃÃo potenciomÃtrica. E, os cÃtions (BÃrio, CÃlcio, EstrÃncio, Ferro Total, LÃtio, MagnÃsio, PotÃssio, SÃdio) utilizando-se a espectrometria de emissÃo Ãptica com plasma acoplado indutivamente. Para tratamento estatÃstico, utilizou-se como ferramenta, a PCA (anÃlise de componentes principais) e a HCA (anÃlise de agrupamento hierÃrquico). Na avaliaÃÃo da qualidade dos dados, utilizou-se o balanÃo iÃnico. Para visualizaÃÃo dos resultados, utilizou-se o grÃfico boxplot, onde se pode observar que o campo de produÃÃo A, seguido do campo de produÃÃo B, possuem tendÃncia à corrosÃo e à incrustaÃÃo, respectivamente. Como tambÃm, o campo de produÃÃo D que apresentou propensÃo à corrosÃo, mas em menor escala. Vale salientar a necessidade de uma caracterizaÃÃo individual das amostras, para conhecimento dos principais constituintes existentes. Pois, esses constituintes podem acarretar elevados custos na manutenÃÃo do processo produtivo da indÃstria petrolÃfera; devido, a corrosÃo do tipo pite, que promove a modificaÃÃo da aparÃncia e estrutura dos aÃos inoxidÃveis, muito utilizados na indÃstria petrolÃfera; e, as incrustaÃÃes, que tendem a se depositar nas paredes das tubulaÃÃes, que podem causar problemas como perda de pressÃo, diminuiÃÃo do escoamento da produÃÃo e aumento no consumo de energia.
In this study, we characterized 238 samples of water produced from four different production fields, all from offshore fields of the Cearà basin, called The field of production, production field B, C production and field production field D. were determined anions (acetate, chloride, formate, sulfate) using ion chromatography; except for the bicarbonate anion was determined using potentiometric titration. And, cations (Barium, Calcium, Strontium, total iron, lithium, magnesium, potassium, sodium) using the optical emission spectrometry with inductively coupled plasma. For statistical analysis, we used as a tool, the PCA (principal component analysis) and HCA (hierarchical cluster analysis). In evaluating the quality of the data, we used the ionic balance. To visualize the results, we used the box plot graph where one can observe that the production field, followed by the production field B, are prone to corrosion and fouling, respectively. As well, the D production field that showed propensity to corrosion, but on a smaller scale. It is worth stressing the need for individual characterization of the samples, to knowledge of the main existing constituents. For these constituents can incur high costs in maintaining the productive process of the oil industry; due to corrosion pitting type, which promotes change the look and structure of stainless steel, widely used in the oil industry; and incrustations which tend to deposit on the walls of pipes, which may cause problems such as pressure loss, decreased production flow and an increase in power consumption.
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Sabuncu, Sinan. "Investigation of enzymes from the respiratory chain by using electrochemical and spectroscopic techniques." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF017/document.

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Le présent travail porte sur l’étude de deux protéines de la famille des oxydases à hème-fer par des techniques de spectroscopie et d’électrochimie. Le premier chapitre décrit l’étude du cytochrome bo3 oxydase issue d’E. coli. Nous nous sommes intéressés à l’étude des interactions enzyme-quinone par l’utilisation de quinones avec des longueurs chaines isoprenyl différentes. Notre but est de mieux comprendre le rôle de la longueur de la chaine des quinones sur l’activité catalytique de l’enzyme et sur les propriétés redox des cofacteurs à hème. Dans l’étape suivante, on a étudié les résidus impliqués dans le site de liaison des quinones (haute affinité, QH). Plusieurs mutations de ces résidus sont étudiées pour mieux comprendre l’importance de chacun des résidus dans cette liaison. Dans la dernière partie de ce premier chapitre, la spectroscopie SEIRAS «spectroscopie d’absorption infrarouge exaltée de surface» est introduite comme une technique alternative pour l’étude des protéines membranaires. Dans le second chapitre, la protéine membranaire cNOR issue de P. denitrificans est étudiée. Nous nous sommes focalisés sur l’effet de différents environnements (pH, présence de protéo-liposomes) sur la stabilité de la cNOR. Pour ce faire, trois valeurs de pH (6.5, 7.5 et 8.5) sont choisies et quelques échantillons de cNOR sont reconstitués dans des protéo-liposomes. Enfin, le donneur de proton terminal (au centre binucléaire) dans la protéine cNOR était étudié. De plus, nous avons étudié les ligands des ions Ca2+ puisqu’il est proposé que le donneur de proton est situé proche de cette région
This thesis is focused on the study of two members of the heme-copper oxidase family by using spectroscopic and electrochemical techniques. In the first chapter cytochrome bo3 oxidase from E. coli was studied. We focused on the quinone-enzyme interactions by using quinones with different isoprenyl chains. Our aim was to better understand the role of isoprenyl chain on the catalytic activity of the enzyme and the redox properties of the heme cofactors. In the next step we studied the residues that are suggested to be in the high-affinity (QH) quinone binding site. Several site-directed mutants of these residues were investigated in order to better understand the position of QH binding site and the importance of each residue. In the last part of this chapter surface-enhanced infrared absorption spectroscopy (SEIRAS) was introduced as an alternative technique to study the membrane proteins. In the second chapter cytochrome c dependent nitric oxide reducates (cNOR) from P. denitrificans was studied. We focused on the effect of different environment (pH, proteoliposomes) on the stability of cNOR. For that purpose three pH values (6.5, 7.5 and 8.5) was selected and some of the cNOR samples were reconstituted in liposomes. Finally, the terminal proton donor (to the binuclear center) in cNOR was investigated. We studied the ligands of the Ca2+ site in cNOR since it was suggested that the proton donor may be close to this area
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Mashamba, Mulalo Gift. "Process potentiometric sequential injection titrations." Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-11212005-093416/.

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Jonsson, Caroline. "Modeling of glyphosate and metal-glyphosate speciation in solution and at solution-mineral interfaces." Doctoral thesis, Umeå : Department of Chemistry, Umeå Univ, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1074.

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Santos, Marcos Alves dos. "Titulações potencio-condutimétricas simultâneas: método, programas para simulação e análise de dados e exemplos reais de aplicação." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-08112010-091604/.

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A despeito dos avanços instrumentais, as titulações continuam sendo largamente aplicadas em laboratórios de química analítica. Seu amplo uso está relacionado com a boa exatidão em aplicações bem estabelecidas e freqüente indicação como método de referência (p. ex., farmacopéias), equipamentos simples, comuns e de custo reduzido, consumo moderado de tempo e de reagentes. Entre as técnicas de titulação, destacam-se as potenciométricas (TP), empregadas universalmente para a quantificação de um ou mais componentes ácidos ou básicos em soluções aquosas ou não aquosas, possibilitando ainda determinar as constantes de dissociação de ácidos e de protonação de bases. Na análise de dados de TP são, via de regra, empregados os métodos clássicos (derivadas), porém, para sistemas compreendendo componentes multiprotonáveis, as inflexões das curvas de titulação deixam ser nítidas, especialmente em baixas concentrações. Nestas condições desfavoráveis, ainda assim podem-se obter resultados satisfatórios recorrendo a métodos de linearização das curvas ou analisando os dados por regressão não linear (RNL), facilmente implementáveis em computadores, hoje disseminados nos laboratórios. Outra técnica clássica para acompanhamento de titulações é a condutimétrica (TC), menos utilizada que a TP nos dias atuais, salvo para ácidos ou bases muito fracas, servindo para prover dados complementares em estudos de formação de complexos ou na caracterização de amostras ambientais. Tipicamente os pontos estequiométricos coincidem com a intersecção de segmentos de reta. Para amostras muito diluídas, com sistemas multipróticos ou com elevada concentração de eletrólitos em relação às espécies tituladas, a interpretação gráfica fica dificultada e a precisão decai. Pesquisas recentes mostraram que é possível aproveitar informações obtidas por TP para alimentar modelos de regressão não linear de TC e, assim, obter informações mais completas das amostras estudadas. No presente trabalho, avançou-se nesta linha criando programas computacionais para a análise simultânea de dados obtidos por TC e TP, empregando o método de RNL e minimizando os desvios (ou o quadrado dos desvios) dos dois conjuntos completos de dados para prover caracterização mais completa das amostras e melhoria na precisão dos resultados. Um programa de simulação de dados de TC e TP das mais diversas combinações e concentrações de sistemas ácido-base, com recursos para acrescentar erros aleatórios às variáveis simuladas, foi também desenvolvido. Permitiu verificar a validade e potencialidade do método da TPC-RNL e aperfeiçoar o programa de análise simultânea de dados. O programa de TPC-RNL foi aplicado inicialmente à re-avaliação de dados de titulações de água de chuva anteriormente coletadas e analisadas por outro colaborador do grupo. Como exemplo de aplicação original a amostras reais difíceis tanto para a TC como a TP isoladamente, determinou-se, por TPC, baixas concentrações de ácidos orgânicos de baixo peso molecular em amostras obtidas do produto de oxidação acelerada do biodiesel. Os resultados se mostraram compatíveis com os obtidos por outro pesquisador que recorreu à eletroforese capilar, sendo que o pH, a condutividade e a força iônica das amostras também foi reproduzida pelo programa Peak Master alimentado com as concentrações ajustadas por RNL
Despite all the advances in instrumental techniques, titrations are still widely applied in analytical chemistry laboratories. Its widespread use is associated with good accuracy, well established applications, simple, readily available and low cost equipment, moderate consumption of time and reagents and frequent indication as a reference method (eg., Pharmacopoeias). Potentiometric titrations (PT) outstands among other techniques, being universally used for the quantification of one or more basic or acidic components in aqueous or non aqueous samples and enabling further determination of the dissociation constants of acids and bases. Data analysis of PT with the glass electrode is typically done by finding the inflections of the curves with help of simple derivatives. However, PT curves of systems with multiprotonable components, specially at very low concentrations, fail to show sharp inflections. Under such unfavorable conditions, satisfactory results can still be obtained by using curve linearization methods or nonlinear regression (NLR) methods, now at the reach of every laboratory computer. Another classic technique for following titrations is conductivity (CT), less used routinely than PT nowadays except for very weak acids or bases, but still valuable as a complementary technique in equilibrium studies of complex formation or for the characterization of environmental samples. The stoichiometric points of simple CTs are found at the intersection of line segments. For very dilute samples or for multiprotic systems or with high concentrations of electrolytes compared to the species to be titrated, the graphical interpretation becomes difficult and the accuracy declines. Recent research has shown that it is possible to harness information obtained by PT to render non-linear regression models of CT solvable, thus extracting more complete information of the samples. This dissertation is devoted to the development and evaluation of software for the simultaneous analysis of data from CT and PT gathered together in the laboratory or by simulation, using the method of NLR with minimization of the weighted deviations (or their squares) of the two full data sets to provide more complete characterization of the samples and to improve the precision of the results. A simulation program for generating CT and PT curves for freely combined acid-base systems over a wide concentration range, with features to add random errors to the simulated variables was also developed. The simulator was used to evaluate the validity and potentiality of the PCTNLR method and improve the software of simultaneous data analysis. The program of PCT-NLR was applied firstly to the re-evaluation of data from titrations of rainwater collected and analyzed previously by another contributor to the group. As an original application example to real samples that are difficult for CT or PT separately, low concentrations of organic acids of low molecular weight were determined by PCT-NLR in samples from accelerated biodiesel oxidation tests. The results were consistent with those obtained by another researcher who used the capillary electrophoresis. The pH, ionic strength and conductivity of the samples were also reproduced by the program Peak Master using concentrations adjusted by NLR
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Kos, Nadja [Verfasser]. "Auswertungsmöglichkeiten und Optimierung potentiometrisch und photometrisch indizierter Titrationen / Nadja Kos." Berlin : Freie Universität Berlin, 2010. http://d-nb.info/1024743829/34.

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Mottot, Yves. "Propriétés chimiques et électrochimiques des chlorures de lanthanides cérides en milieux chlorures fondus : stabilité thermodynamique des alliages LA-NI et ND-FE à haute température." Paris 6, 1986. http://www.theses.fr/1986PA066127.

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Etude thermodynamique et cinétique de la réduction électrolytique de terres rares cériques, réalisée au sein de l'eutectique fondu LICL-KCL. Comportement singulier du néodyme étudié dans l'eutectique BACL::(2)-KCL jusqu'à 1300k; on montre que la stabilité de ND(II) croit avec la température. Etude des alliages entre les métaux des terres rares et les métaux de transition de composition générale LNM::(X), dont les propriétés thermodynamiques ont été déterminées par mesure de la F. E. M. De la pile LN/LNCL::(3), LICL+KCL/LNM::(X); application aux alliages LA-NI ET ND-FE entre 700 et 800K.
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Books on the topic "Potentiometric titration"

1

Potentiometry and potentiometric titrations. Malabar, Fla: Krieger Pub. Co., 1991.

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Selwyn, Lyndsie. Analysis of the chloride ion concentration in aqueous solutions by potentiometric titration. Ottawa, Ont: Canadian Conservation Institute, 2001.

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Analysis of the chloride ion concentration in aqueous solutions by potentiometric titration. CCI, 2001.

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Verdingh, V. Interlaboratory Comparison Exercise for the Determination of Uranium by Potentiometric Titration (First Phase). European Communities / Union (EUR-OP/OOPEC/OPOCE), 1991.

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Néher-Neumann, Erzsébet. Advanced Potentiometry: Potentiometric Titrations and Their Systematic Errors. Springer, 2010.

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Hindagolla, Suraj L. A study of the oxide/solution interface by capacitance measurements of electrolyte/oxide/semiconductor structures and potentiometric titrations of colloidal oxide suspensions. 1985.

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Book chapters on the topic "Potentiometric titration"

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Avdeef, Alex, and John E. A. Comer. "Measurement of pKa and log P of water-insoluble substances by potentiometric titration." In Trends in QSAR and Molecular Modelling 92, 386–87. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1472-1_87.

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Neumann, Erzsébet Néher. "Emf Titrations Proposed for the Determination of Certain Transport Numbers [1]." In Advanced Potentiometry, 199–211. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9525-2_7.

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Neumann, Erzsébet Néher. "On Emf Titrations Proposed for the Determination of Some Interaction Coefficients [1]." In Advanced Potentiometry, 181–97. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9525-2_6.

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Fang, Linchuan, Peng Cai, Pengxiang Li, Wei Liang, and Qiaoyun Huang. "Microcalorimetric and Potentiometric Titration Studies on the Adsorption of Copper by P. putida and B. thuringiensis and Their Composites with Minerals." In Molecular Environmental Soil Science at the Interfaces in the Earth’s Critical Zone, 62–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-05297-2_19.

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Gans, Peter, and Alberto Vacca. "Potentiometric Titration." In Encyclopedia of Supramolecular Chemistry, 1–5. CRC Press, 2004. http://dx.doi.org/10.1081/e-esmc-120024349.

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HÖDREJÄRV, H., K. KERM, and A. VAARMANN. "POTENTIOMETRIC TITRATION OF PHOSPHATE IONS IN NATURAL WATERS." In Ion-Selective Electrodes, 379–86. Elsevier, 1989. http://dx.doi.org/10.1016/b978-0-08-037933-3.50025-9.

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Rudan-Tasič, D., and C. Klofutar. "Potentiometric titration of poly(α-D)galacturonic acid." In Progress in Biotechnology, 609–17. Elsevier, 1996. http://dx.doi.org/10.1016/s0921-0423(96)80293-0.

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"Ionization Equilibrium and Potentiometric Titration of Weak Polyelectrolytes." In Physical Chemistry of Polyelectrolyte Solutions, 67–114. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781119057338.ch3.

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Kellermeier, Matthias, Helmut Cölfen, and Denis Gebauer. "Investigating the Early Stages of Mineral Precipitation by Potentiometric Titration and Analytical Ultracentrifugation." In Research Methods in Biomineralization Science, 45–69. Elsevier, 2013. http://dx.doi.org/10.1016/b978-0-12-416617-2.00003-5.

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Naja, G., S. Deneux-Mustin, C. Mustin, J. Rouiller, C. Munier-Lamy, and J. Bertherlin. "Potentiometric titration: a dynamic method to study the metal binding-mechanism of microbial biomass." In Biohydrometallurgy and the Environment Toward the Mining of the 21st Century - Proceedings of the International Biohydrometallurgy Symposium, 201–10. Elsevier, 1999. http://dx.doi.org/10.1016/s1572-4409(99)80109-6.

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Conference papers on the topic "Potentiometric titration"

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Kommu, Aruna, Raghavendra Rao Kanchi, and Naveen Kumar Uttarkar. "Design and development of microcontroller based peristaltic pump for automatic potentiometric titration." In 2014 International Conference on Communications and Signal Processing (ICCSP). IEEE, 2014. http://dx.doi.org/10.1109/iccsp.2014.6949819.

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Jakubowska, M., B. Baś, E. Niewiara, W. Reczyński, W. W. Kubiak, George Maroulis, and Theodore E. Simos. "Potentiometric Titration of Industrial Samples—End-point Detection by Means of Wavelets." In COMPUTATIONAL METHODS IN SCIENCE AND ENGINEERING: Advances in Computational Science: Lectures presented at the International Conference on Computational Methods in Sciences and Engineering 2008 (ICCMSE 2008). AIP, 2009. http://dx.doi.org/10.1063/1.3225386.

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Albiol Chiva, Jaume, Juan Peris Vicente, María José Ruiz Ángel, Mar Esteve Amorós, Samuel Carda Broch, Pau Esteve Amorós, Estel la Esteve Amorós, Diego Kassuha, and Josep Esteve Romero. "Implementation of Computer Assisted Experimental Work in Analytical Chemistry Laboratory Teaching." In Fifth International Conference on Higher Education Advances. Valencia: Universitat Politècnica València, 2019. http://dx.doi.org/10.4995/head19.2019.9161.

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Computer-Assisted Experimental Work (CAEW) consists in the incorporation of computer-connected apparatus in the laboratory. This is a new insight into teaching of Classical Analytical Chemistry, wherein the experiments are usually manually conducted. However, it does not represent a complete break with traditional methodology, as the design and goal of the experiment are essentially the same. In this work, we present the implementation of CAEW to a practical included in the Laboratory part of “Analytical Chemistry IV”, taught at the fourth academic year of the Degree in Chemistry: “Potentiometric titration of a mixture of iodure and chlorure with silver”. Three couples of students used an Ag-ion selective electrode connected to a computer, while the other three couples employed a digital one. The results were comparable, though the computer-assisted method provided significant improvements, like; the students get familiar with new technologies at an accessible level, the titration can be visually followed on the screen via the titration curve, the calculations are automatically performed, allowing the detection of experimental and registration of mistakes, it avoids errors caused by the transcription and processing of the data, and the students achieve their practical disposing of the final results, and all their work corrected by the teacher.
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Kirby, Glen H., Kevin M. Cooley, and Beth L. Armstrong. "Tailored Rheological Behavior of Mullite and BSAS Suspensions Using a Cationic Polyelectrolyte." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68491.

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The effects of a cationic polyelectrolyte, polyethylenimine, on the rheological behavior of aqueous mullite and celsian phase, barium strontium aluminosilicate (BSAS) suspensions have been studied to optimize a dip-coating process. The surface of the ceramic particles was characterized in aqueous media using zeta potential measurements. The ionization behavior and hydrodynamic radius of polyethylenimine in aqueous media was characterized by potentiometric titration and dynamic light scattering measurements, respectively. The rheological behavior of concentrated ceramic suspensions containing polyethylenimine was characterized by stress viscometry and elastic modulus measurements. Polyethylenimine imparts repulsive, electrosteric interactions between mullite and BSAS particles in aqueous suspension, resulting in shear thinning flow behavior, linear elastic moduli, and yield stress values that are minimized for suspensions with a critical PEI concentration of 0.2 mg PEI per m2 of mullite and 0.4 mg PEI per m2 of BSAS, respectively. The elastic moduli and yield stress of mullite and BSAS suspensions were nearly identical at equivalent fractions of their critical PEI concentration. Uniform coatings were obtained upon dipping SiC, Si3N4, and Si-metal substrates into shear-thinning suspensions containing PEI at 81–88% of the critical concentration. Dense mullite coatings were demonstrated on SiC substrates after sintering at 1400°C.
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Bangerth, Stefan, Harish Ganapathy, Michael Ohadi, Tariq S. Khan, and Mohamed Alshehhi. "Study of CO2 Absorption Into Aqueous Diethanolamine (DEA) Using Microchannel Reactors." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36348.

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Removal of CO2 from gas streams is a major step in the purification of natural gas and of interest for carbon capture and storage applications. Industrial scale implementations of the process with most state of the art technologies use aqueous alkanolamines as liquid solvents to chemically absorb CO2. Although the kinetics of the absorption process are fast, sufficient absorption performance can only be met by very large columns due to the limited interfacial area present between gas and liquid phases in these systems. In the present study we utilize micro structure surfaces in two-phase regime to provide substantially higher interfacial area and hence enhanced mass transfer characteristics. We report experimental data on the separation of CO2 from a gas stream containing 10% CO2 and 90% N2 by volume. An aqueous solution of 20% diethanolamine in water by weight was used as the solvent, and absorption performance was measured by potentiometric titration of the liquid product with potassium hydroxide. The microchannel-based reactors had circular cross-sectional geometry with an inner diameter of 762 μm and two different lengths of 10 cm and 30 cm. Additionally, blank experiments were performed for component-level analysis. Parametric studies varying the gas and liquid phase superficial velocities were conducted and discussed. The potential to use microchannel reaction systems in multiple pass configurations for scaled up implementation was investigated. The present work achieved mass transfer coefficients that are at least one order of magnitude higher than those of most conventional absorption technologies, thus indicating the substantial process intensification that can be achieved using the proposed microreactor system for CO2 separation processes.
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Wang, Jintao, Xiang Liu, Jingyue Zhang, Lin Tong, and Long Zhang. "Ultra micro liquid volume measurement system based on potentiometrie titration principle." In 2016 International Conference on Integrated Circuits and Microsystems (ICICM). IEEE, 2016. http://dx.doi.org/10.1109/icam.2016.7813604.

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Reports on the topic "Potentiometric titration"

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Cureton, LaShonda T., George Fountzoulas, and John J. La Scala. Molecular Weight Measurement of Biobased Furan Polyamides via Non-Aqueous Potentiometric Titration. Fort Belvoir, VA: Defense Technical Information Center, June 2013. http://dx.doi.org/10.21236/ada586113.

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Christensen, Earl, Jack Ferrell, Mariefel V. Olarte, Asanga B. Padmaperuma, and Teresa Lemmon. Acid Number Determination of Pyrolysis Bio-oils using Potentiometric Titration: Laboratory Analytical Procedure (LAP). Office of Scientific and Technical Information (OSTI), March 2016. http://dx.doi.org/10.2172/1241091.

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Black, Stuart, Jack Ferrell, Mariefel V. Olarte, and Asanga B. Padmaperuma. Determination of Carbonyls in Pyrolysis Bio-oils by Potentiometric Titration. Faix Method. Laboratory Analytical Procedure (LAP). Office of Scientific and Technical Information (OSTI), March 2016. http://dx.doi.org/10.2172/1241099.

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Engmann, J., H. W. Blanch, and J. M. Prausnitz. Protein-salt binding data from potentiometric titrations of lysozyme in aqueous solutions containing KCl. Office of Scientific and Technical Information (OSTI), March 1997. http://dx.doi.org/10.2172/486115.

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